Education

Following Up | Tyler Talgo (2L)

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Using matrices to manipulate data: Game show | Matrices | Precalculus | Khan Academy

In other videos, we saw how we can use matrices to represent real-world situations. Once we do that, we can also manipulate the matrices (using...

Using matrices to manipulate data: Pet store | Matrices | Precalculus | Khan Academy

In other videos, we saw how we can use matrices to represent real-world situations. Once we do that, we can also manipulate the matrices (using...

Worked example: Writing empirical formulas for ionic compounds| High school chemistry | Khan Academy

To write the empirical formula for an ionic compound, we use the periodic table to identify the metallic cation and the nonmetallic anion and write...

Empirical formulas for ionic compounds | High school chemistry | Khan Academy

The arrangement of the periodic table by increasing atomic number places elements with similar chemical properties in the same columns (groups)....

Elements, atoms and subatomic particles | High school chemistry | Khan Academy

An atom is the smallest unit of an element that still maintains the properties of that element. Each atom has a charged substructure consisting of...

Magnetism and Magnetic Fields | Types of Interactions | High School Physics | Khan Academy

Forces at a distance are explained by fields (gravitational, electric, and magnetic) permeating space that can transfer energy through space....

Introduction to Momentum | Forces and Motion | High School Physics | Khan Academy

Momentum is defined for a particular frame of reference; it is the mass times the velocity of the object. Khan Academy is a nonprofit organization...

Systems and Objects | Dynamics | AP Physics I | Khan Academy

Systems are collections of objects. Objects can be treated as if they have no internal structure. You can treat a system as an object if the...

Contact Forces | Dynamics | AP Physics 1 | Khan Academy

In order for objects to exert a contact force, the objects must be touching. Common examples of contact forces include tension, the normal force,...

Agency | Royden G. Derrick | 1983

The gift of agency is central to the Plan of Salvation. Using our agency to follow God's commandments gives us true independence and power over our...